Ultrasonic Distance Sensor with PIC16F630 Microcontroller

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The LED distance warning sensor includes a HC-SR04 ultrasonic module connected to a PIC16F630 microcontroller. This simple circuit flashes the diode when an object is within 1 metre with the relevant rate of its distance; the closer the faster.

Raspberry Pi Web Server – RGB LED Control Over The Internet

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This Java application is to demonstrate how to control a tri-colour (RGB) LED from the internet. Tomcat servlet is running on a Raspberry Pi and the user can interfere with the Pi’s GPIO’s (General Purpose Input Output) from the web browser. A complete hardware and software setup is included in the write-up.

Controlling The Raspberry Pi's GPIOs From The Internet